kosokubus.com

We performed a comprehensive analysis of kosokubus.com on 2026-06-30. The website returned an HTTP 200 status code with a server response time of 9871ms. The page is served over HTTP/1.1 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 246 KB. The website uses a secure HTTPS connection with a valid SSL certificate issued by Let's Encrypt (DV type). The connection is encrypted using TLS 1.3 with the TLS_AES_256_GCM_SHA384 cipher suite and sha256WithRSAEncryption signature algorithm. The certificate covers 2 domain(s) (Subject Alternative Names) and expires on 2026-08-17, which is 48 days from now. The security headers analysis reveals a score of 30/100 (below average). The following security headers are properly configured: X-Frame-Options and X-Content-Type-Options. However, the site is missing Content-Security-Policy, Strict-Transport-Security (HSTS), Referrer-Policy, and Permissions-Policy, which could expose the site and its users to cross-site scripting (XSS), clickjacking, and other web-based attacks. Our technology detection scan identified 6 technologies across 6 categories powering kosokubus.com. The detected stack includes Vue.js, Google Analytics 4, Google Tag Manager, StackPath, jQuery 3.4.1., and Font Awesome. The UI is built with Vue.js. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, kosokubus.com receives an overall trust score of 71/100, classified as "Likely Safe".

After conducting a thorough safety and legitimacy analysis, kosokubus.com receives a trust score of 71/100, which places it in the "Likely Safe" category. This score is calculated by evaluating multiple factors including SSL certificate validity, domain registration history, email authentication protocols, security header configuration, and blacklist status across major threat intelligence databases. The analysis identified several positive trust signals: a valid HTTPS connection protecting data in transit, a valid SSL certificate issued by Let's Encrypt with 48 days until expiration, SPF (Sender Policy Framework) email authentication preventing email spoofing, DMARC email authentication with a none policy, and a well-established domain registered for over 19.6 years, indicating long-term commitment and legitimacy. Areas of concern include: the absence of a Content-Security-Policy header, which leaves the site more vulnerable to cross-site scripting (XSS) attacks, missing Referrer-Policy, potentially leaking URL information to third parties, the domain's WHOIS information is hidden behind a privacy service, making it harder to verify the owner's identity, and DNSSEC is not enabled, leaving DNS queries vulnerable to spoofing attacks. While these issues don't necessarily indicate malicious intent, they represent areas where the website's security posture could be improved. We checked kosokubus.com against 8 major blacklist databases including Google Safe Browsing, Phishtank, Urlhaus, Openphish, Dnsfilter, Spamhaus Dbl, Surbl, and Virustotal. The domain passed all 8 checks with a clean status, meaning it has not been flagged for phishing, malware distribution, spam, or other malicious activities by any of the tested threat intelligence providers. The domain is registered through GMO Internet Group, Inc. d/b/a Onamae.com based in JP, with a registration date of 2006-11-24 and expiration date of 2026-11-24.

Our technology detection engine scanned kosokubus.com and identified 6 distinct technologies across 6 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. UI Library: Vue.js — handles the user interface rendering and component management for kosokubus.com. Analytics: Google Analytics 4 — tracks visitor behavior and provides traffic insights for kosokubus.com. Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for kosokubus.com. CDN: StackPath — accelerates content delivery by caching assets at edge locations worldwide for kosokubus.com. JavaScript Library: jQuery (version 3.4.1.) — provides utility functions and DOM manipulation for kosokubus.com. Icon Set: Font Awesome — provides additional functionality for kosokubus.com. We also extracted the following tracking identifiers: Google Tag Manager container GTM-5Q42GZ3. These IDs can be used to identify other websites operated by the same organization.

kosokubus.com delivers its homepage in 9871ms (server response time), which is considered slow by industry standards. The total page weight is 246 KB, and we detected 532 resource requests loading assets from 28 third-party domains. A high number of third-party domains can significantly impact page load time due to additional DNS lookups and TLS handshakes required for each domain. The website uses Gzip compression for text-based assets, achieving an estimated 60.0% reduction in transfer size. This reduces bandwidth usage and improves page load times, especially for visitors on slower connections. Asset minification status: 1 out of 16 CSS files and 12 out of 23 JavaScript files are minified. Minifying the remaining 26 unminified file(s) could further reduce page weight by 10-30% for those assets. Minification is a best practice that reduces download sizes without affecting functionality. From an environmental perspective, each page view of kosokubus.com produces approximately 0.12g of CO₂, earning a carbon rating of A. This places the website among the cleanest on the web, demonstrating efficient use of server resources and optimized content delivery. For reference, the average web page produces about 0.5g of CO₂ per page view. The page weight of 246 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for kosokubus.com. This typically means the site doesn't have enough real-world Chrome user traffic to generate statistically significant field data, or the domain is not included in the CrUX dataset. Core Web Vitals (LCP, INP, CLS) are important Google ranking factors that measure real user experience.

kosokubus.com resolves to the IPv4 address 210.255.213.87, but does not support IPv6. IPv6 adoption is increasingly important as IPv4 address space becomes exhausted, and some ISPs and regions are transitioning to IPv6-only connectivity. The domain has 1 A record(s) configured. The domain name system is managed by 3 name servers: fjkdns11.alpha-prm.jp, fjkdns12.alpha-prm.jp, and fjkdns13.alpha-prm.jp. Having 3 name servers provides good redundancy — if one fails, the others can continue serving DNS queries. The choice of name servers often indicates the DNS hosting provider or CDN service being used. Email for kosokubus.com is handled by alpha-prm.jp with 1 MX records configured: mxi.alpha-prm.jp. Multiple MX records provide failover redundancy — if the primary mail server is unavailable, email will be routed to the next available server. SPF (Sender Policy Framework) is configured, which specifies which mail servers are authorized to send email on behalf of this domain. This helps prevent email spoofing and improves email deliverability. DMARC (Domain-based Message Authentication, Reporting and Conformance) is configured with a none policy — a monitoring-only setting that doesn't enforce any action on unauthorized emails. DKIM was not detected. Without DKIM, recipients cannot cryptographically verify that emails claiming to be from this domain are authentic. DNSSEC is not enabled for kosokubus.com. While not critical for most websites, DNSSEC adds an important security layer by ensuring DNS responses haven't been tampered with during transit. Enabling DNSSEC is recommended for domains handling sensitive data or financial transactions. The domain is registered through GMO Internet Group, Inc. d/b/a Onamae.com (JP). It was first registered on 2006-11-24 and is set to expire on 2026-11-24, making it 19.6 years old. Our subdomain enumeration scan discovered 3 active subdomains for kosokubus.com: app.kosokubus.com, mail.kosokubus.com, and www.kosokubus.com. Active subdomains can reveal the organization's infrastructure, including development environments, API endpoints, and third-party service integrations.

The homepage of kosokubus.com contains 2,180 words of visible text content. This is a substantial amount of content that provides good opportunities for search engine indexing. The page is structured with 16 H2 headings, 13 H3 headings, 17 H4 headings. The page includes 104 images. 1 images (1%) are missing alt text attributes, which is a significant concern for both accessibility and SEO. Screen readers rely on alt text to describe images to visually impaired users, and search engines use alt text to understand image content. Only 99% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 205 internal links pointing to other pages on the same domain and 32 external links pointing to third-party websites. The high number of internal links suggests a well-interconnected site structure, which helps search engines discover and crawl all pages efficiently. There are 23 external JavaScript files, 16 CSS stylesheets, and 1 iframes on the page. The site implements the following web standards and features: robots.txt (controls search engine crawling behavior) and Schema.org structured data (Answer, ContactPoint, FAQPage, Organization, Person, PostalAddress, and Question). Notable missing features: XML Sitemap. Adding these could improve search engine discoverability and rich result eligibility. We detected the following payment methods accepted on kosokubus.com: Visa, Mastercard, American Express, and JCB. Offering multiple payment options including credit cards and digital wallets improves customer trust and can increase conversion rates. The website has social media presence across 3 platforms: Twitter (@kosokubus_com), Instagram (@kosokubuscom), and Youtube (@%E5%85%AC%E5%BC%8F%E9%AB%98%E9%80%9F%E3%83%90%E3%82%B9%E3%83%89%E3%83%83%E3%83%88%E3%82%B3%E3%83%A0%E3%83%81%E3%83%A3%E3%83%B3%E3%83%8D%E3%83%AB). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for kosokubus.com is good at 27 characters: "高速バスドットコムで高速バス・夜行バスの格安比較・予約". The length is acceptable, though it may be slightly truncated in some search result displays. The meta description is 74 characters (well-optimized): "新機能「おまとめ予約」開始！複数便をまとめて予約・決済。1億人以上が利用した日本最大級の高速バス予約サイト。全国160社・3000便以上を簡単比較。". Google typically displays up to 155-160 characters of the meta description in search results. A compelling meta description with a clear call-to-action can significantly improve click-through rates from search results. The canonical url is correctly set to https://www.kosokubus.com/, preventing duplicate content issues and a favicon is configured. Open Graph meta tags are configured with 4/4 recommended fields: OG title ("高速バスドットコムで高速バス・夜行バスの格安比較・予約..."), OG description, OG image (social sharing thumbnail), OG type (website). These tags control how the page appears when shared on Facebook, LinkedIn, and other social media platforms that support the Open Graph protocol. The site implements Schema.org structured data with the following types: Answer, ContactPoint, FAQPage, Organization, Person, PostalAddress, and Question. Structured data helps search engines understand the page content and can enable rich results (featured snippets, knowledge panels, star ratings) in Google search results, which can significantly increase click-through rates. The meta keywords tag contains 6 terms including 夜行バス, 高速バス, 格安, 予約, and 東京. Note: Google has officially confirmed that it does not use the meta keywords tag as a ranking signal. However, some other search engines (Bing, Yandex) may still reference it.